package com.securitydemo.securitydemo.handler;

import com.securitydemo.securitydemo.utils.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * jwt登录授权过滤器
 */
public class JwtAuthorizationTokenFilter extends OncePerRequestFilter {
    @Value("${jwt.tokenHeader}")

    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String header = request.getHeader(tokenHeader);

        if(null!=header&&header.startsWith(tokenHead)){
            String token = header.substring(tokenHead.length());
            String username = jwtTokenUtil.getUsernameFromToken(token);
            /**
             * token存在用户名但是未登录
             */
            if(null!=username&&null== SecurityContextHolder.getContext().getAuthentication()){
                //登录
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                //判断token是否有效
                if(jwtTokenUtil.validateToken(token,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken=
                            new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }
        }
        filterChain.doFilter(request,response);
    }
}
